Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4854e7e748c1189…

MALICIOUS

PDF

53.8 KB Created: 2020-08-30 05:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1675769e011c5a421ee02e540fa4babf SHA-1: 0d159329054695b3d07f39ce0712ed460be1ac1f SHA-256: e4854e7e748c118966785113339b8b7daf3f9c34432fcbb7abd849cb2e16e731
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link that leads to a farm of other PDF files, likely for SEO poisoning or to obscure the final destination. The document body, though heavily obfuscated, contains the primary malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=scooby+doo+pirates+ahoy+transcript
    • https://static.usrfiles.com/ugd/7e0eb0_5cd2dd12e080406b85480ce8ed8b437a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4f7ac90e6dd4d6b9195487a5d661922.pdf
    • https://static.usrfiles.com/ugd/daca0d_f8f98f8b010a474a8d63d19c72ca00d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b089d3b1d70b428681402cc08f38a9eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed5ff982e8504dd98857a5e5da02b28d.pdf
    • https://cdn.shopify.com/s/files/1/0437/1120/1435/files/augusto_csar_sandino.pdf
    • https://cdn.shopify.com/s/files/1/0439/2668/3816/files/ligepufapumuxisidiwuda.pdf
    • https://static.usrfiles.com/ugd/f1d680_7b0245ae68c648959e945f2f7b000f61.pdf
    • https://static.usrfiles.com/ugd/eda9ba_1146a925292b454886af2f77997c4866.pdf
    • https://static.usrfiles.com/ugd/ea78e0_261c9714671f40d787b414fe482a52d1.pdf
    • https://static.usrfiles.com/ugd/c068f8_db09f2c14fed45cca46fdcd7744a407f.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/24959165717.pdf
    • https://cdn.shopify.com/s/files/1/0436/2685/6601/files/chinese_language_learning_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/cara_gta_5_di_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/carbohydrates_notes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000094ae.bin
ae9c5916b1766f8034794a72f843cb44bd3fd66de4e5b6f79272434dc80a6f86
pdf-font-stream PDF embedded font (sfnt) at offset 0x94AE 5472 bytes
font_01_sfnt_off0000a730.bin
dcdc32572e9285d543d9d8cb67cbec078590c571c84f5d9bad69fac5460d8786
pdf-font-stream PDF embedded font (sfnt) at offset 0xA730 10372 bytes